Portable charger



FIG. 1 is a perspective view of a portable charger showing the claimed design;

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines (if any) showing the environment in any figures are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a portable charger, as shown and described. 